mcs/mcs/attribute.cs

   1 //\r
   2 // attribute.cs: Attribute Handler\r
   3 //\r
   4 // Author: Ravi Pratap (ravi@ximian.com)\r
   5 //\r
   6 // Licensed under the terms of the GNU GPL\r
   7 //\r
   8 // (C) 2001 Ximian, Inc (http://www.ximian.com)\r
   9 //\r
  10 //\r
  11 \r
  12 using System;\r
  13 using System.Diagnostics;\r
  14 using System.Collections;\r
  15 using System.Reflection;\r
  16 using System.Reflection.Emit;\r
  17 using System.Runtime.InteropServices;\r
  18 using System.Runtime.CompilerServices;\r
  19 using System.Text;\r
  20 \r
  21 namespace Mono.CSharp {\r
  22 \r
  23         public class Attribute {\r
  24                 public readonly string    Name;\r
  25                 public readonly ArrayList Arguments;\r
  26 \r
  27                 Location Location;\r
  28 \r
  29                 public Type Type;\r
  30                 \r
  31                 //\r
  32                 // The following are only meaningful when the attribute\r
  33                 // being emitted is one of the builtin ones\r
  34                 //\r
  35                 AttributeTargets Targets;\r
  36                 bool AllowMultiple;\r
  37                 bool Inherited;\r
  38 \r
  39                 bool UsageAttr = false;\r
  40                 \r
  41                 MethodImplOptions ImplOptions;\r
  42                 UnmanagedType     UnmanagedType;\r
  43                 CustomAttributeBuilder cb;\r
  44                 \r
  45                 public Attribute (string name, ArrayList args, Location loc)\r
  46                 {\r
  47                         Name = name;\r
  48                         Arguments = args;\r
  49                         Location = loc;\r
  50                 }\r
  51 \r
  52                 void Error_InvalidNamedArgument (string name)\r
  53                 {\r
  54                         Report.Error (617, Location, "'" + name + "' is not a valid named attribute " +\r
  55                                       "argument. Named attribute arguments must be fields which are not " +\r
  56                                       "readonly, static or const, or properties with a set accessor which "+\r
  57                                       "are not static.");\r
  58                 }\r
  59 \r
  60                 void Error_AttributeArgumentNotValid ()\r
  61                 {\r
  62                         Report.Error (182, Location,\r
  63                                       "An attribute argument must be a constant expression, typeof " +\r
  64                                       "expression or array creation expression");\r
  65                 }\r
  66 \r
  67                 static void Error_AttributeConstructorMismatch (Location loc)\r
  68                 {\r
  69                         Report.Error (\r
  70                                         -6, loc,\r
  71                                         "Could not find a constructor for this argument list.");\r
  72                 }\r
  73                 \r
  74                 private Type CheckAttributeType (EmitContext ec) {\r
  75                         Type t;\r
  76                         bool isattributeclass = true;\r
  77                         \r
  78                         t = RootContext.LookupType (ec.DeclSpace, Name, true, Location);\r
  79                         if (t != null) {\r
  80                                 isattributeclass = t.IsSubclassOf (TypeManager.attribute_type);\r
  81                                 if (isattributeclass)\r
  82                                         return t;\r
  83                         }\r
  84                         t = RootContext.LookupType (ec.DeclSpace, Name + "Attribute", true, Location);\r
  85                         if (t != null) {\r
  86                                 if (t.IsSubclassOf (TypeManager.attribute_type))\r
  87                                         return t;\r
  88                         }\r
  89                         if (!isattributeclass) {\r
  90                                 Report.Error (616, Location, "'" + Name + "': is not an attribute class");\r
  91                                 return null;\r
  92                         }\r
  93                         if (t != null) {\r
  94                                 Report.Error (616, Location, "'" + Name + "Attribute': is not an attribute class");\r
  95                                 return null;\r
  96                         }\r
  97                         Report.Error (\r
  98                                 246, Location, "Could not find attribute '" + Name + "' (are you" +\r
  99                                 " missing a using directive or an assembly reference ?)");\r
 100                         return null;\r
 101                 }\r
 102 \r
 103                 public Type ResolveType (EmitContext ec)\r
 104                 {\r
 105                         Type = CheckAttributeType (ec);\r
 106                         return Type;\r
 107                 }\r
 108 \r
 109                 \r
 110                 public CustomAttributeBuilder Resolve (EmitContext ec)\r
 111                 {\r
 112                         if (Type == null)\r
 113                                 Type = CheckAttributeType (ec);\r
 114                         if (Type == null)\r
 115                                 return null;\r
 116 \r
 117                         bool MethodImplAttr = false;\r
 118                         bool MarshalAsAttr = false;\r
 119 \r
 120                         UsageAttr = false;\r
 121 \r
 122                         if (Type == TypeManager.attribute_usage_type)\r
 123                                 UsageAttr = true;\r
 124                         if (Type == TypeManager.methodimpl_attr_type)\r
 125                                 MethodImplAttr = true;\r
 126                         if (Type == TypeManager.marshal_as_attr_type)\r
 127                                 MarshalAsAttr = true;\r
 128 \r
 129                         // Now we extract the positional and named arguments\r
 130                         \r
 131                         ArrayList pos_args = new ArrayList ();\r
 132                         ArrayList named_args = new ArrayList ();\r
 133                         int pos_arg_count = 0;\r
 134                         \r
 135                         if (Arguments != null) {\r
 136                                 pos_args = (ArrayList) Arguments [0];\r
 137                                 if (pos_args != null)\r
 138                                         pos_arg_count = pos_args.Count;\r
 139                                 if (Arguments.Count > 1)\r
 140                                         named_args = (ArrayList) Arguments [1];\r
 141                         }\r
 142 \r
 143                         object [] pos_values = new object [pos_arg_count];\r
 144 \r
 145                         //\r
 146                         // First process positional arguments \r
 147                         //\r
 148 \r
 149                         int i;\r
 150                         for (i = 0; i < pos_arg_count; i++) {\r
 151                                 Argument a = (Argument) pos_args [i];\r
 152                                 Expression e;\r
 153 \r
 154                                 if (!a.Resolve (ec, Location))\r
 155                                         return null;\r
 156 \r
 157                                 e = a.Expr;\r
 158                                 if (e is Constant) {\r
 159                                         pos_values [i] = ((Constant) e).GetValue ();\r
 160                                 } else if (e is TypeOf) {\r
 161                                         pos_values [i] = ((TypeOf) e).TypeArg;\r
 162                                 } else {\r
 163                                         Console.WriteLine ("Foo " + e);\r
 164                                         Error_AttributeArgumentNotValid ();\r
 165                                         return null;\r
 166                                 }\r
 167                                 \r
 168                                 if (UsageAttr)\r
 169                                         this.Targets = (AttributeTargets) pos_values [0];\r
 170                                 \r
 171                                 if (MethodImplAttr)\r
 172                                         this.ImplOptions = (MethodImplOptions) pos_values [0];\r
 173                                 \r
 174                                 if (MarshalAsAttr)\r
 175                                         this.UnmanagedType =\r
 176                                         (System.Runtime.InteropServices.UnmanagedType) pos_values [0];\r
 177                         }\r
 178 \r
 179                         //\r
 180                         // Now process named arguments\r
 181                         //\r
 182 \r
 183                         ArrayList field_infos = new ArrayList ();\r
 184                         ArrayList prop_infos  = new ArrayList ();\r
 185                         ArrayList field_values = new ArrayList ();\r
 186                         ArrayList prop_values = new ArrayList ();\r
 187                         \r
 188                         for (i = 0; i < named_args.Count; i++) {\r
 189                                 DictionaryEntry de = (DictionaryEntry) named_args [i];\r
 190                                 string member_name = (string) de.Key;\r
 191                                 Argument a  = (Argument) de.Value;\r
 192                                 Expression e;\r
 193                                 \r
 194                                 if (!a.Resolve (ec, Location))\r
 195                                         return null;\r
 196 \r
 197                                 Expression member = Expression.MemberLookup (\r
 198                                         ec, Type, member_name,\r
 199                                         MemberTypes.Field | MemberTypes.Property,\r
 200                                         BindingFlags.Public | BindingFlags.Instance,\r
 201                                         Location);\r
 202 \r
 203                                 if (member == null || !(member is PropertyExpr || member is FieldExpr)) {\r
 204                                         Error_InvalidNamedArgument (member_name);\r
 205                                         return null;\r
 206                                 }\r
 207 \r
 208                                 e = a.Expr;\r
 209                                 if (member is PropertyExpr) {\r
 210                                         PropertyExpr pe = (PropertyExpr) member;\r
 211                                         PropertyInfo pi = pe.PropertyInfo;\r
 212 \r
 213                                         if (!pi.CanWrite) {\r
 214                                                 Error_InvalidNamedArgument (member_name);\r
 215                                                 return null;\r
 216                                         }\r
 217 \r
 218                                         if (e is Constant) {\r
 219                                                 object o = ((Constant) e).GetValue ();\r
 220                                                 prop_values.Add (o);\r
 221                                                 \r
 222                                                 if (UsageAttr) {\r
 223                                                         if (member_name == "AllowMultiple")\r
 224                                                                 this.AllowMultiple = (bool) o;\r
 225                                                         if (member_name == "Inherited")\r
 226                                                                 this.Inherited = (bool) o;\r
 227                                                 }\r
 228                                                 \r
 229                                         } else if (e is TypeOf) {\r
 230                                                 prop_values.Add (((TypeOf) e).TypeArg);\r
 231                                         } else {\r
 232                                                 Error_AttributeArgumentNotValid ();\r
 233                                                 return null;\r
 234                                         }\r
 235                                         \r
 236                                         prop_infos.Add (pi);\r
 237                                         \r
 238                                 } else if (member is FieldExpr) {\r
 239                                         FieldExpr fe = (FieldExpr) member;\r
 240                                         FieldInfo fi = fe.FieldInfo;\r
 241 \r
 242                                         if (fi.IsInitOnly) {\r
 243                                                 Error_InvalidNamedArgument (member_name);\r
 244                                                 return null;\r
 245                                         }\r
 246 \r
 247                                         //\r
 248                                         // Handle charset here, and set the TypeAttributes\r
 249                                         \r
 250                                         if (e is Constant){\r
 251                                                 object value = ((Constant) e).GetValue ();\r
 252                                                 \r
 253                                                 field_values.Add (value);\r
 254                                         } else if (e is TypeOf) {\r
 255                                                 field_values.Add (((TypeOf) e).TypeArg);\r
 256                                         } else {\r
 257                                                 Error_AttributeArgumentNotValid ();\r
 258                                                 return null;\r
 259                                         }\r
 260                                         \r
 261                                         field_infos.Add (fi);\r
 262                                 }\r
 263                         }\r
 264 \r
 265                         Expression mg = Expression.MemberLookup (\r
 266                                 ec, Type, ".ctor", MemberTypes.Constructor,\r
 267                                 BindingFlags.Public | BindingFlags.Instance, Location);\r
 268 \r
 269                         if (mg == null) {\r
 270                                 Error_AttributeConstructorMismatch (Location);\r
 271                                 return null;\r
 272                         }\r
 273 \r
 274                         MethodBase constructor = Invocation.OverloadResolve (\r
 275                                 ec, (MethodGroupExpr) mg, pos_args, Location);\r
 276 \r
 277                         if (constructor == null) {\r
 278                                 Error_AttributeConstructorMismatch (Location);\r
 279                                 return null;\r
 280                         }\r
 281                         \r
 282                         PropertyInfo [] prop_info_arr = new PropertyInfo [prop_infos.Count];\r
 283                         FieldInfo [] field_info_arr = new FieldInfo [field_infos.Count];\r
 284                         object [] field_values_arr = new object [field_values.Count];\r
 285                         object [] prop_values_arr = new object [prop_values.Count];\r
 286 \r
 287                         field_infos.CopyTo  (field_info_arr, 0);\r
 288                         field_values.CopyTo (field_values_arr, 0);\r
 289 \r
 290                         prop_values.CopyTo  (prop_values_arr, 0);\r
 291                         prop_infos.CopyTo   (prop_info_arr, 0);\r
 292 \r
 293                         try {\r
 294                                 cb = new CustomAttributeBuilder (\r
 295                                         (ConstructorInfo) constructor, pos_values,\r
 296                                         prop_info_arr, prop_values_arr,\r
 297                                         field_info_arr, field_values_arr); \r
 298                         } catch (NullReferenceException) {\r
 299                                 Report.Warning (\r
 300                                         -23, Location,\r
 301                                         "The compiler can not encode this attribute in the Mono runtime\n" +\r
 302                                         "\tdue to a known bug in it.  We know about the problem and will\n" +\r
 303                                         "\tfix it as soon as possible.");\r
 304                         } catch {\r
 305                                 //\r
 306                                 // Sample:\r
 307                                 // using System.ComponentModel;\r
 308                                 // [DefaultValue (CollectionChangeAction.Add)]\r
 309                                 // class X { static void Main () {} }\r
 310                                 //\r
 311                                 Report.Warning (\r
 312                                         -23, Location,\r
 313                                         "The compiler can not encode this attribute in .NET due to\n" +\r
 314                                         "\ta bug in the .NET runtime.  Try the Mono runtime");\r
 315                         }\r
 316                         \r
 317                         return cb;\r
 318                 }\r
 319 \r
 320                 static string GetValidPlaces (Attribute attr)\r
 321                 {\r
 322                         StringBuilder sb = new StringBuilder ();\r
 323                         AttributeTargets targets = 0;\r
 324                         \r
 325                         TypeContainer a = TypeManager.LookupAttr (attr.Type);\r
 326 \r
 327                         if (a == null) {\r
 328                                 \r
 329                                 System.Attribute [] attrs = null;\r
 330                                 \r
 331                                 try {\r
 332                                         attrs = System.Attribute.GetCustomAttributes (attr.Type);\r
 333                                         \r
 334                                 } catch {\r
 335                                         Report.Error (-20, attr.Location, "Cannot find attribute type " + attr.Name +\r
 336                                                       " (maybe you forgot to set the usage using the" +\r
 337                                                       " AttributeUsage attribute ?).");\r
 338                                         return null;\r
 339                                 }\r
 340                                         \r
 341                                 foreach (System.Attribute tmp in attrs)\r
 342                                         if (tmp is AttributeUsageAttribute) {\r
 343                                                 targets = ((AttributeUsageAttribute) tmp).ValidOn;\r
 344                                                 break;\r
 345                                         }\r
 346                         } else\r
 347                                 targets = a.Targets;\r
 348 \r
 349                         \r
 350                         if ((targets & AttributeTargets.Assembly) != 0)\r
 351                                 sb.Append ("'assembly' ");\r
 352 \r
 353                         if ((targets & AttributeTargets.Class) != 0)\r
 354                                 sb.Append ("'class' ");\r
 355 \r
 356                         if ((targets & AttributeTargets.Constructor) != 0)\r
 357                                 sb.Append ("'constructor' ");\r
 358 \r
 359                         if ((targets & AttributeTargets.Delegate) != 0)\r
 360                                 sb.Append ("'delegate' ");\r
 361 \r
 362                         if ((targets & AttributeTargets.Enum) != 0)\r
 363                                 sb.Append ("'enum' ");\r
 364 \r
 365                         if ((targets & AttributeTargets.Event) != 0)\r
 366                                 sb.Append ("'event' ");\r
 367 \r
 368                         if ((targets & AttributeTargets.Field) != 0)\r
 369                                 sb.Append ("'field' ");\r
 370 \r
 371                         if ((targets & AttributeTargets.Interface) != 0)\r
 372                                 sb.Append ("'interface' ");\r
 373 \r
 374                         if ((targets & AttributeTargets.Method) != 0)\r
 375                                 sb.Append ("'method' ");\r
 376 \r
 377                         if ((targets & AttributeTargets.Module) != 0)\r
 378                                 sb.Append ("'module' ");\r
 379 \r
 380                         if ((targets & AttributeTargets.Parameter) != 0)\r
 381                                 sb.Append ("'parameter' ");\r
 382 \r
 383                         if ((targets & AttributeTargets.Property) != 0)\r
 384                                 sb.Append ("'property' ");\r
 385 \r
 386                         if ((targets & AttributeTargets.ReturnValue) != 0)\r
 387                                 sb.Append ("'return value' ");\r
 388 \r
 389                         if ((targets & AttributeTargets.Struct) != 0)\r
 390                                 sb.Append ("'struct' ");\r
 391 \r
 392                         return sb.ToString ();\r
 393 \r
 394                 }\r
 395 \r
 396                 public static void Error_AttributeNotValidForElement (Attribute a, Location loc)\r
 397                 {\r
 398                         Report.Error (\r
 399                                 592, loc, "Attribute '" + a.Name +\r
 400                                 "' is not valid on this declaration type. " +\r
 401                                 "It is valid on " + GetValidPlaces (a) + "declarations only.");\r
 402                 }\r
 403 \r
 404                 public static bool CheckAttribute (Attribute a, object element)\r
 405                 {\r
 406                         TypeContainer attr = TypeManager.LookupAttr (a.Type);\r
 407                         AttributeTargets targets = 0;\r
 408 \r
 409                         \r
 410                         if (attr == null) {\r
 411 \r
 412                                 System.Attribute [] attrs = null;\r
 413                                 \r
 414                                 try {\r
 415                                         attrs = System.Attribute.GetCustomAttributes (a.Type);\r
 416 \r
 417                                 } catch {\r
 418                                         Report.Error (-20, a.Location, "Cannot find attribute type " + a.Name +\r
 419                                                       " (maybe you forgot to set the usage using the" +\r
 420                                                       " AttributeUsage attribute ?).");\r
 421                                         return false;\r
 422                                 }\r
 423                                         \r
 424                                 foreach (System.Attribute tmp in attrs)\r
 425                                         if (tmp is AttributeUsageAttribute) \r
 426                                                 targets = ((AttributeUsageAttribute) tmp).ValidOn;\r
 427                         } else\r
 428                                 targets = attr.Targets;\r
 429 \r
 430                         if (element is Class) {\r
 431                                 if ((targets & AttributeTargets.Class) != 0)\r
 432                                         return true;\r
 433                                 else\r
 434                                         return false;\r
 435                                 \r
 436                         } else if (element is Struct) {\r
 437                                 if ((targets & AttributeTargets.Struct) != 0)\r
 438                                         return true;\r
 439                                 else\r
 440                                         return false;\r
 441                         } else if (element is Constructor) {\r
 442                                 if ((targets & AttributeTargets.Constructor) != 0)\r
 443                                         return true;\r
 444                                 else\r
 445                                         return false;\r
 446                         } else if (element is Delegate) {\r
 447                                 if ((targets & AttributeTargets.Delegate) != 0)\r
 448                                         return true;\r
 449                                 else\r
 450                                         return false;\r
 451                         } else if (element is Enum) {\r
 452                                 if ((targets & AttributeTargets.Enum) != 0)\r
 453                                         return true;\r
 454                                 else\r
 455                                         return false;\r
 456                         } else if (element is Event || element is InterfaceEvent) {\r
 457                                 if ((targets & AttributeTargets.Event) != 0)\r
 458                                         return true;\r
 459                                 else\r
 460                                         return false;\r
 461                         } else if (element is Field || element is FieldBuilder) {\r
 462                                 if ((targets & AttributeTargets.Field) != 0)\r
 463                                         return true;\r
 464                                 else\r
 465                                         return false;\r
 466                         } else if (element is Interface) {\r
 467                                 if ((targets & AttributeTargets.Interface) != 0)\r
 468                                         return true;\r
 469                                 else\r
 470                                         return false;\r
 471                         } else if (element is Method || element is Operator || element is InterfaceMethod || element is Accessor) {\r
 472                                 if ((targets & AttributeTargets.Method) != 0)\r
 473                                         return true;\r
 474                                 else\r
 475                                         return false;\r
 476                         } else if (element is ParameterBuilder) {\r
 477                                 if ((targets & AttributeTargets.Parameter) != 0)\r
 478                                         return true;\r
 479                                 else\r
 480                                         return false;\r
 481                         } else if (element is Property || element is Indexer ||\r
 482                                    element is InterfaceProperty || element is InterfaceIndexer) {\r
 483                                 if ((targets & AttributeTargets.Property) != 0)\r
 484                                         return true;\r
 485                                 else\r
 486                                         return false;\r
 487                         } else if (element is AssemblyBuilder){\r
 488                                 if ((targets & AttributeTargets.Assembly) != 0)\r
 489                                         return true;\r
 490                                 else\r
 491                                         return false;\r
 492                         }\r
 493 \r
 494                         return false;\r
 495                 }\r
 496 \r
 497                 //\r
 498                 // This method should be invoked to pull the IndexerName attribute from an\r
 499                 // Indexer if it exists.\r
 500                 //\r
 501                 public static string ScanForIndexerName (EmitContext ec, Attributes opt_attrs)\r
 502                 {\r
 503                         if (opt_attrs == null)\r
 504                                 return null;\r
 505                         if (opt_attrs.AttributeSections == null)\r
 506                                 return null;\r
 507 \r
 508                         foreach (AttributeSection asec in opt_attrs.AttributeSections) {\r
 509                                 if (asec.Attributes == null)\r
 510                                         continue;\r
 511 \r
 512                                 foreach (Attribute a in asec.Attributes){\r
 513                                         if (a.ResolveType (ec) == null)\r
 514                                                 return null;\r
 515                                         \r
 516                                         if (a.Type != TypeManager.indexer_name_type)\r
 517                                                 continue;\r
 518 \r
 519                                         //\r
 520                                         // So we have found an IndexerName, pull the data out.\r
 521                                         //\r
 522                                         if (a.Arguments == null || a.Arguments [0] == null){\r
 523                                                 Error_AttributeConstructorMismatch (a.Location);\r
 524                                                 return null;\r
 525                                         }\r
 526                                         ArrayList pos_args = (ArrayList) a.Arguments [0];\r
 527                                         if (pos_args.Count == 0){\r
 528                                                 Error_AttributeConstructorMismatch (a.Location);\r
 529                                                 return null;\r
 530                                         }\r
 531                                         \r
 532                                         Argument arg = (Argument) pos_args [0];\r
 533                                         if (!arg.Resolve (ec, a.Location))\r
 534                                                 return null;\r
 535                                         \r
 536                                         Expression e = arg.Expr;\r
 537                                         if (!(e is StringConstant)){\r
 538                                                 Error_AttributeConstructorMismatch (a.Location);\r
 539                                                 return null;\r
 540                                         }\r
 541 \r
 542                                         //\r
 543                                         // Remove the attribute from the list\r
 544                                         //\r
 545                                         asec.Attributes.Remove (a);\r
 546 \r
 547                                         return (((StringConstant) e).Value);\r
 548                                 }\r
 549                         }\r
 550                         return null;\r
 551                 }\r
 552 \r
 553                 //\r
 554                 // This pulls the condition name out of a Conditional attribute\r
 555                 //\r
 556                 public string Conditional_GetConditionName ()\r
 557                 {\r
 558                         //\r
 559                         // So we have a Conditional, pull the data out.\r
 560                         //\r
 561                         if (Arguments == null || Arguments [0] == null){\r
 562                                 Error_AttributeConstructorMismatch (Location);\r
 563                                 return null;\r
 564                         }\r
 565 \r
 566                         ArrayList pos_args = (ArrayList) Arguments [0];\r
 567                         if (pos_args.Count != 1){\r
 568                                 Error_AttributeConstructorMismatch (Location);\r
 569                                 return null;\r
 570                         }\r
 571 \r
 572                         Argument arg = (Argument) pos_args [0]; \r
 573                         if (!(arg.Expr is StringConstant)){\r
 574                                 Error_AttributeConstructorMismatch (Location);\r
 575                                 return null;\r
 576                         }\r
 577 \r
 578                         return ((StringConstant) arg.Expr).Value;\r
 579                 }\r
 580 \r
 581                 //\r
 582                 // This pulls the obsolete message and error flag out of an Obsolete attribute\r
 583                 //\r
 584                 public string Obsolete_GetObsoleteMessage (out bool is_error)\r
 585                 {\r
 586                         is_error = false;\r
 587                         //\r
 588                         // So we have an Obsolete, pull the data out.\r
 589                         //\r
 590                         if (Arguments == null || Arguments [0] == null)\r
 591                                 return "";\r
 592 \r
 593                         ArrayList pos_args = (ArrayList) Arguments [0];\r
 594                         if (pos_args.Count == 0)\r
 595                                 return "";\r
 596                         else if (pos_args.Count > 2){\r
 597                                 Error_AttributeConstructorMismatch (Location);\r
 598                                 return null;\r
 599                         }\r
 600 \r
 601                         Argument arg = (Argument) pos_args [0]; \r
 602                         if (!(arg.Expr is StringConstant)){\r
 603                                 Error_AttributeConstructorMismatch (Location);\r
 604                                 return null;\r
 605                         }\r
 606 \r
 607                         if (pos_args.Count == 2){\r
 608                                 Argument arg2 = (Argument) pos_args [1];\r
 609                                 if (!(arg2.Expr is BoolConstant)){\r
 610                                         Error_AttributeConstructorMismatch (Location);\r
 611                                         return null;\r
 612                                 }\r
 613                                 is_error = ((BoolConstant) arg2.Expr).Value;\r
 614                         }\r
 615 \r
 616                         return ((StringConstant) arg.Expr).Value;\r
 617                 }\r
 618 \r
 619                 //\r
 620                 // Applies the attributes to the `builder'.\r
 621                 //\r
 622                 public static void ApplyAttributes (EmitContext ec, object builder, object kind,\r
 623                                                     Attributes opt_attrs, Location loc)\r
 624                 {\r
 625                         if (opt_attrs == null)\r
 626                                 return;\r
 627                         if (opt_attrs.AttributeSections == null)\r
 628                                 return;\r
 629 \r
 630                         foreach (AttributeSection asec in opt_attrs.AttributeSections) {\r
 631                                 if (asec.Attributes == null)\r
 632                                         continue;\r
 633 \r
 634                                 if (asec.Target == "assembly" && !(builder is AssemblyBuilder))\r
 635                                         continue;\r
 636                                 \r
 637                                 foreach (Attribute a in asec.Attributes) {\r
 638                                         CustomAttributeBuilder cb = a.Resolve (ec);\r
 639 \r
 640                                         if (cb == null)\r
 641                                                 continue;\r
 642 \r
 643                                         if (!(kind is TypeContainer))\r
 644                                                 if (!CheckAttribute (a, kind)) {\r
 645                                                         Error_AttributeNotValidForElement (a, loc);\r
 646                                                         return;\r
 647                                                 }\r
 648 \r
 649                                         if (kind is Method || kind is Operator || kind is InterfaceMethod ||\r
 650                                             kind is Accessor) {\r
 651                                                 if (a.Type == TypeManager.methodimpl_attr_type) {\r
 652                                                         if (a.ImplOptions == MethodImplOptions.InternalCall)\r
 653                                                                 ((MethodBuilder) builder).\r
 654                                                                 SetImplementationFlags (\r
 655                                                                         MethodImplAttributes.InternalCall |\r
 656                                                                         MethodImplAttributes.Runtime);\r
 657                                                 } else if (a.Type != TypeManager.dllimport_type){\r
 658                                                         ((MethodBuilder) builder).SetCustomAttribute (cb);\r
 659                                                 }\r
 660                                         } else if (kind is Constructor) {\r
 661                                                 ((ConstructorBuilder) builder).SetCustomAttribute (cb);\r
 662                                         } else if (kind is Field) {\r
 663                                                 ((FieldBuilder) builder).SetCustomAttribute (cb);\r
 664                                         } else if (kind is Property || kind is Indexer ||\r
 665                                                    kind is InterfaceProperty || kind is InterfaceIndexer) {\r
 666                                                 ((PropertyBuilder) builder).SetCustomAttribute (cb);\r
 667                                         } else if (kind is Event || kind is InterfaceEvent) {\r
 668                                                 ((MyEventBuilder) builder).SetCustomAttribute (cb);\r
 669                                         } else if (kind is ParameterBuilder) {\r
 670 \r
 671                                                 if (a.Type == TypeManager.marshal_as_attr_type) {\r
 672                                                         UnmanagedMarshal marshal =\r
 673                                                                 UnmanagedMarshal.DefineUnmanagedMarshal (a.UnmanagedType);\r
 674                                                         \r
 675                                                         ((ParameterBuilder) builder).SetMarshal (marshal);\r
 676                                                 } else \r
 677                                                         ((ParameterBuilder) builder).SetCustomAttribute (cb);\r
 678                                                 \r
 679                                         } else if (kind is Enum) {\r
 680                                                 ((TypeBuilder) builder).SetCustomAttribute (cb); \r
 681 \r
 682                                         } else if (kind is TypeContainer) {\r
 683                                                 TypeContainer tc = (TypeContainer) kind;\r
 684                                                 \r
 685                                                 if (a.UsageAttr) {\r
 686                                                         tc.Targets = a.Targets;\r
 687                                                         tc.AllowMultiple = a.AllowMultiple;\r
 688                                                         tc.Inherited = a.Inherited;\r
 689                                                         \r
 690                                                 } else if (a.Type == TypeManager.default_member_type) {\r
 691                                                         if (tc.Indexers != null) {\r
 692                                                                 Report.Error (646, loc,\r
 693                                                                       "Cannot specify the DefaultMember attribute on" +\r
 694                                                                       " a type containing an indexer");\r
 695                                                                 return;\r
 696                                                         }\r
 697 \r
 698                                                 } else {\r
 699                                                         if (!CheckAttribute (a, kind)) {\r
 700                                                                 Error_AttributeNotValidForElement (a, loc);\r
 701                                                                 return;\r
 702                                                         }\r
 703                                                 }\r
 704 \r
 705                                                 try {\r
 706                                                         ((TypeBuilder) builder).SetCustomAttribute (cb);\r
 707                                                 } catch (System.ArgumentException) {\r
 708                                                         Report.Warning (\r
 709                                                                 -21, loc,\r
 710                                                 "The CharSet named property on StructLayout\n"+\r
 711                                                 "\tdoes not work correctly on Microsoft.NET\n"+\r
 712                                                 "\tYou might want to remove the CharSet declaration\n"+\r
 713                                                 "\tor compile using the Mono runtime instead of the\n"+\r
 714                                                 "\tMicrosoft .NET runtime");\r
 715                                                 }\r
 716                                                 \r
 717                                         } else if (kind is Interface) {\r
 718                                                 Interface iface = (Interface) kind;\r
 719 \r
 720                                                 if ((a.Type == TypeManager.default_member_type) &&\r
 721                                                     (iface.InterfaceIndexers != null)) {\r
 722                                                         Report.Error (\r
 723                                                                 646, loc,\r
 724                                                                 "Cannot specify the DefaultMember attribute on" +\r
 725                                                                 " a type containing an indexer");\r
 726                                                         return;\r
 727                                                 }\r
 728 \r
 729                                                 if (!CheckAttribute (a, kind)) {\r
 730                                                         Error_AttributeNotValidForElement (a, loc);\r
 731                                                         return;\r
 732                                                 }\r
 733 \r
 734                                                 ((TypeBuilder) builder).SetCustomAttribute (cb);\r
 735                                         } else if (kind is AssemblyBuilder){\r
 736                                                 ((AssemblyBuilder) builder).SetCustomAttribute (cb);\r
 737                                         } else if (kind is ModuleBuilder) {\r
 738                                                 ((ModuleBuilder) builder).SetCustomAttribute (cb);\r
 739                                         } else if (kind is FieldBuilder) {\r
 740                                                 ((FieldBuilder) builder).SetCustomAttribute (cb);\r
 741                                         } else\r
 742                                                 throw new Exception ("Unknown kind: " + kind);\r
 743                                 }\r
 744                         }\r
 745                 }\r
 746 \r
 747                 public MethodBuilder DefinePInvokeMethod (EmitContext ec, TypeBuilder builder, string name,\r
 748                                                           MethodAttributes flags, Type ret_type, Type [] param_types)\r
 749                 {\r
 750                         //\r
 751                         // We extract from the attribute the information we need \r
 752                         //\r
 753 \r
 754                         if (Arguments == null) {\r
 755                                 Console.WriteLine ("Internal error : this is not supposed to happen !");\r
 756                                 return null;\r
 757                         }\r
 758 \r
 759                         Type = CheckAttributeType (ec);\r
 760                         if (Type == null)\r
 761                                 return null;\r
 762                         \r
 763                         ArrayList named_args = new ArrayList ();\r
 764                         \r
 765                         ArrayList pos_args = (ArrayList) Arguments [0];\r
 766                         if (Arguments.Count > 1)\r
 767                                 named_args = (ArrayList) Arguments [1];\r
 768                         \r
 769 \r
 770                         string dll_name = null;\r
 771                         \r
 772                         Argument tmp = (Argument) pos_args [0];\r
 773 \r
 774                         if (!tmp.Resolve (ec, Location))\r
 775                                 return null;\r
 776                         \r
 777                         if (tmp.Expr is Constant)\r
 778                                 dll_name = (string) ((Constant) tmp.Expr).GetValue ();\r
 779                         else { \r
 780                                 Error_AttributeArgumentNotValid ();\r
 781                                 return null;\r
 782                         }\r
 783 \r
 784                         // Now we process the named arguments\r
 785                         CallingConvention cc = CallingConvention.Winapi;\r
 786                         CharSet charset = CharSet.Ansi;\r
 787                         bool preserve_sig = true;\r
 788                         bool exact_spelling = false;\r
 789                         bool set_last_err = false;\r
 790                         string entry_point = null;\r
 791 \r
 792                         for (int i = 0; i < named_args.Count; i++) {\r
 793 \r
 794                                 DictionaryEntry de = (DictionaryEntry) named_args [i];\r
 795 \r
 796                                 string member_name = (string) de.Key;\r
 797                                 Argument a  = (Argument) de.Value;\r
 798 \r
 799                                 if (!a.Resolve (ec, Location))\r
 800                                         return null;\r
 801 \r
 802                                 Expression member = Expression.MemberLookup (\r
 803                                         ec, Type, member_name, \r
 804                                         MemberTypes.Field | MemberTypes.Property,\r
 805                                         BindingFlags.Public | BindingFlags.Instance,\r
 806                                         Location);\r
 807 \r
 808                                 if (member == null || !(member is FieldExpr)) {\r
 809                                         Error_InvalidNamedArgument (member_name);\r
 810                                         return null;\r
 811                                 }\r
 812 \r
 813                                 if (member is FieldExpr) {\r
 814                                         FieldExpr fe = (FieldExpr) member;\r
 815                                         FieldInfo fi = fe.FieldInfo;\r
 816 \r
 817                                         if (fi.IsInitOnly) {\r
 818                                                 Error_InvalidNamedArgument (member_name);\r
 819                                                 return null;\r
 820                                         }\r
 821 \r
 822                                         if (a.Expr is Constant) {\r
 823                                                 Constant c = (Constant) a.Expr;\r
 824                                                 \r
 825                                                 if (member_name == "CallingConvention")\r
 826                                                         cc = (CallingConvention) c.GetValue ();\r
 827                                                 else if (member_name == "CharSet")\r
 828                                                         charset = (CharSet) c.GetValue ();\r
 829                                                 else if (member_name == "EntryPoint")\r
 830                                                         entry_point = (string) c.GetValue ();\r
 831                                                 else if (member_name == "SetLastError")\r
 832                                                         set_last_err = (bool) c.GetValue ();\r
 833                                                 else if (member_name == "ExactSpelling")\r
 834                                                         exact_spelling = (bool) c.GetValue ();\r
 835                                                 else if (member_name == "PreserveSig")\r
 836                                                         preserve_sig = (bool) c.GetValue ();\r
 837                                         } else { \r
 838                                                 Error_AttributeArgumentNotValid ();\r
 839                                                 return null;\r
 840                                         }\r
 841                                         \r
 842                                 }\r
 843                         }\r
 844 \r
 845                         if (entry_point == null)\r
 846                                 entry_point = name;\r
 847                         \r
 848                         MethodBuilder mb = builder.DefinePInvokeMethod (\r
 849                                 name, dll_name, entry_point, flags | MethodAttributes.HideBySig,\r
 850                                 CallingConventions.Standard,\r
 851                                 ret_type,\r
 852                                 param_types,\r
 853                                 cc,\r
 854                                 charset);\r
 855 \r
 856                         if (preserve_sig)\r
 857                                 mb.SetImplementationFlags (MethodImplAttributes.PreserveSig);\r
 858                         \r
 859                         return mb;\r
 860                 }\r
 861                 \r
 862         }\r
 863         \r
 864         public class AttributeSection {\r
 865                 \r
 866                 public readonly string    Target;\r
 867                 public readonly ArrayList Attributes;\r
 868                 \r
 869                 public AttributeSection (string target, ArrayList attrs)\r
 870                 {\r
 871                         Target = target;\r
 872                         Attributes = attrs;\r
 873                 }\r
 874                 \r
 875         }\r
 876 \r
 877         public class Attributes {\r
 878                 public ArrayList AttributeSections;\r
 879                 public Location Location;\r
 880 \r
 881                 public Attributes (AttributeSection a, Location loc)\r
 882                 {\r
 883                         AttributeSections = new ArrayList ();\r
 884                         AttributeSections.Add (a);\r
 885 \r
 886                 }\r
 887 \r
 888                 public void AddAttribute (AttributeSection a)\r
 889                 {\r
 890                         if (a != null)\r
 891                                 AttributeSections.Add (a);\r
 892                 }\r
 893         }\r
 894 }\r